I've seen a lot of takes on #Meta and defederation, but I've only seen them in context of whether microblogging servers (masto et al) should federate or not. I've not seen any real discussion yet on the interaction between #Lemmy/#Kbin and #Threads.
Even though, I think this is where one of the real strength of the fediverse is: the ability to interact not only cross server, but also cross platform.